Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

M54b25 -> M54b30 is pretty close to M50 -> S50... (unless you're talking euro version). Nonetheless, a 41-51hp increase in horsepower is not insignificant, especially when you're starting with 184. That's a 22-28% increase in power. The torque delta is similar in magnitude as well. IMO that's more than enough to be considered night and day.

The BMW is finished, i should be picking it up later today or tomorrow, he said im getting a check engine light due to my high flow air intake though, i'll put the factory box back on and see what happens, pictures to come...

The BMW is finished, i should be picking it up later today or tomorrow, he said im getting a check engine light due to my high flow air intake though, i'll put the factory box back on and see what happens, pictures to come...

Congrats, I also have an 01 325i so I am very interested in the power difference as you never know I may try this. The first pics look awesome congrats man.

I picked it up today, 2600 bucks total plus new gaskets which was cheap. Engine looks and runs great and the power difference WOW! It will run now, before I thought I was fast but now it's just the perfect amount. It glides up to 75 alot easier and pulls definitely alot harder! I think it was worth it. Ill post pictures after I get home from church

I did once when I had the 2.5 in there but it took awhile, cruised to 100 smooth, ill ride this one for a few weeks nice and easy to make sure it holds together b4 I open her up, now I need to install my new back tires and control arm bushings, and hope my CEL for the MAF goes away